26 lines
707 B
Ruby
26 lines
707 B
Ruby
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# Given a sorted integer array without duplicates, return the summary of its ranges.#
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# example: [0,1,2,4,5,7], return ["0->2","4->5","7"].
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#
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# @param {Integer[]} numbers
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# @return {String[]}
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def summary_ranges(numbers)
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ranges = []
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last_number = numbers.shift
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current_range = [last_number]
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(0..numbers.length).each do |index|
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if last_number + 1 == numbers[index]
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current_range << numbers[index]
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elsif current_range.length == 1
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ranges += current_range
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current_range = [numbers[index]]
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else
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ranges << "#{current_range.first}->#{current_range.last}"
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current_range = [numbers[index]]
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end
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last_number = numbers[index]
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end
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ranges
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end
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